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js_disable_filter.h
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1 /*
2  * Copyright 2010 Google Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http:///www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
18 
19 #ifndef NET_INSTAWEB_REWRITER_PUBLIC_JS_DISABLE_FILTER_H_
20 #define NET_INSTAWEB_REWRITER_PUBLIC_JS_DISABLE_FILTER_H_
21 
25 #include "pagespeed/kernel/base/basictypes.h"
26 #include "pagespeed/kernel/base/string.h"
27 #include "pagespeed/kernel/html/html_element.h"
28 #include "pagespeed/kernel/html/html_filter.h"
29 #include "pagespeed/kernel/http/user_agent_matcher.h"
30 
31 namespace net_instaweb {
32 
40 class JsDisableFilter : public CommonFilter {
41  public:
42  explicit JsDisableFilter(RewriteDriver* driver);
43  ~JsDisableFilter();
44 
45  static const char kEnableJsExperimental[];
46  static const char kElementOnloadCode[];
47 
48  virtual void DetermineEnabled(GoogleString* disabled_reason);
49 
50  virtual const char* Name() const {
51  return "JsDisableFilter";
52  }
53 
54  ScriptUsage GetScriptUsage() const override { return kWillInjectScripts; }
55 
56  private:
57  virtual void StartDocumentImpl();
58 
59  virtual void StartElementImpl(HtmlElement* element);
60 
61  virtual void EndElementImpl(HtmlElement* element);
62 
63  virtual void EndDocument();
64 
66  void InsertJsDeferExperimentalScript();
67 
71  void InsertMetaTagForIE(HtmlElement* element);
72 
73  ScriptTagScanner script_tag_scanner_;
74  int index_;
75  bool ie_meta_tag_written_;
76  int prefetch_js_elements_count_;
77  int max_prefetch_js_elements_;
78  GoogleString prefetch_js_elements_;
79  bool should_look_for_prefetch_js_elements_;
80  UserAgentMatcher::PrefetchMechanism prefetch_mechanism_;
81 
82 
83 };
84 
85 }
86 
87 #endif
Definition: common_filter.h:47
Definition: rewrite_driver.h:98
Definition: script_tag_scanner.h:30
Definition: js_disable_filter.h:40